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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aee958b34bd7b3eeb4b3d49b83f0c90184af016712ae9b6f0d51295b2ba6625c' 
  AND token = '10xRWSyutTxUcpaC4QSNPrjrooYWAXOke/TJiOhIFg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}